As the Edinburgh festival approaches, Ed Byrne, Susan Calman, Stevie Martin and others on why their pets are friends, companions and a source of inspiration Comedians are needy, so of course we get dogs " they're always pleased to see you. My cardigan corgi suits me: short legs, Welsh, doesn't like walking. He's called Ci, which is Welsh for "dog". He's so sweet, but the thickest dog I have ever had. Weapons-grade st…